A finite difference study on the basement structure beneath the Tianshan Orogen

doi:10.1360/04zd0021

	A finite difference study on the basement structure beneath the Tianshan Orogen
	Zhao, JM ; Wang, OC ; Gao, X ; Duan, YH ; Jia, SX ; Pan, SZ
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2004-09-01
卷号	47 页码:16-23
关键词	finite difference Tianshan Orogen structure of the upper crust
ISSN号	1006-9313
DOI	10.1360/04zd0021
文献子类	Article
英文摘要	We use the Pg seismic phase along the Korla-Jimsar profile across the Tianshan orogen and the 3D finite difference method to inverse the velocity structure of the upper crust beneath the basement of this mountain. Based on the velocity structure, the Korla-Jimsar profile can be divided into three parts, i.e. the north edge of the Tarim basin, the Tianshan orogen, and the south margin of the Junggar basin. Within the Tianshan there is a pattern of four convexities and three concavities, which correspond to the southern Tianshan, the Yanqi basin, the middle Tianshan, the Turpan basin, and the Bogda Mountains. In the north edge of the Tarim basin, the basement is about 10km deep with small lateral variations of velocity. In the Tianshan the velocity varies greatly laterally. The basement depth of the Yanqi basin is 6 km, which becomes shallow rapidly northward, and almost to the surface at the middle Tianshan. South to Kumux there is a small intermountain basin, where the maximum basement depth is 3 km, and also turns very shallow near Kumux. The Luntai fault, which bounds the Tarim basin and Tianshan, has vertical dislocation of about 5 km. The Turpan basin is covered with so thick a sediment that its basement is 7 km deep. The boundary fault between the Tianshan and Turpan is the Bolohoro fault which is characterized by quick deepening basement and 7 km vertical dislocation. In the Junggar basin the basement is 8 km deep. On the Korla-Jimsar profile, the velocity distribution of the upper crust and the structure are featured by NS symmetry on both sides of the axis of the Middle Tianshan, consistent with the deep structure revealed by this profile. It means that the Tarim basin and the Junggar basin underthrust toward the Tianshan from south and north, respectively. Such a structural style is different from that of another profile, i.e. the Xayar-Burjing profile, suggesting that there may be an important tectonic boundary between these two profiles.
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000225775100002
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/79611]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhao, JM
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China 2.China Seismol Bur, Inst Geol, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.China Seismol Bur, Geophys Explorat Ctr, Zhenzhou 450002, Peoples R China
推荐引用方式 GB/T 7714	Zhao, JM,Wang, OC,Gao, X,et al. A finite difference study on the basement structure beneath the Tianshan Orogen[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2004,47:16-23.
APA	Zhao, JM,Wang, OC,Gao, X,Duan, YH,Jia, SX,&Pan, SZ.(2004).A finite difference study on the basement structure beneath the Tianshan Orogen.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,47,16-23.
MLA	Zhao, JM,et al."A finite difference study on the basement structure beneath the Tianshan Orogen".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 47(2004):16-23.